Hi Norm,

I usually grab a tap to check the thread 100 percent but I'm sure from memory they are 1/8 BSP.

They are the same for some old bikes as we know. $3. 61 for the thread tap.

Cheers
max.

Attachments
fuel tap 1_8 BSP.png (271.32 KB, 44 downloads)
thread tap 1_8 BSP.png (86.76 KB, 44 downloads)